How to Grow Basil in Australia
Basil is the quintessential summer herb and one of the most valuable companion plants in the Australian raised bed garden. It thrives in the same warm conditions as tomatoes and capsicum, deters aphids and whitefly, and delivers fragrant harvests for months when picked regularly. A staple of Italian cooking, it also performs beautifully in Thai and Vietnamese-style gardens.
Basil Growing Quick Reference
Plant Spacing
20 cm apart
30 cm between rows
Days to Harvest
25–35 days to first harvest; ongoing
Germination: 5–10 days
Sun Needs
Full sun (6+ hours daily)
Water Needs
Moderate — water at the base; basil hates wet foliage
Soil pH
6.0–7.0
Expected Yield
Ongoing — a single plant can produce 300–500g over a season with regular harvesting
When to Plant Basil in Australia
Planting times vary significantly across Australia's five climate zones. Find your zone below for the best planting windows.
| Climate Zone | Best Planting Months |
|---|---|
| 🌴 Tropical (Darwin, Cairns) | Year-round (reduce watering in wet season) |
| ☀️ Subtropical (Brisbane, Northern NSW) | August–March |
| 🍂 Temperate (Sydney, Melbourne, Perth) | September–February |
| ❄️ Cool/Alpine (Canberra, Hobart, high country) | October–January |
| 🏜️ Arid (Alice Springs, outback) | August–February |
Not sure of your climate zone? Enter your postcode to get personalised planting advice.
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How to Grow Basil in Australia
Basil is a warm-season annual herb that collapses at the first frost and sulks in cold soil. In Australian raised beds, it is best planted as a companion to tomatoes and capsicum after the soil has warmed in spring. Sow seed 5mm deep direct into the bed, or start indoors 4 weeks before transplanting.
Once established, basil is remarkably low-maintenance. The critical management technique is regular harvesting and flower removal. As soon as flower buds appear at the shoot tips, pinch them out — allowing basil to flower reduces the essential oil concentration in the leaves, making them less flavourful. Pinch off the top two sets of leaves regularly to encourage bushy, branching growth rather than a single tall stem.
There are dozens of basil varieties suited to Australian conditions: large-leafed 'Genovese' (Italian basil, best for pesto); 'Thai Sweet Basil' for Asian cooking; 'Lemon Basil' and 'Lime Basil' for fragrant salads; 'Purple Ruffles' for visual impact and mild flavour; 'Greek Mini' for compact edging. All share the same growing requirements.
In tropical climates, basil can become large and shrubby — harvest aggressively to prevent woodiness. In the subtropical and temperate south, plant fresh seedlings every 6–8 weeks through the warm season for continuous supply.
Basil makes an excellent companion planted at the base of tomato plants — it is said to repel aphids and improve fruit flavour, and the canopy of the tomato provides some welcome afternoon shade in midsummer.
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Companion Planting with Basil
Grows Well With
These plants make excellent neighbours for basil in your raised beds — they help deter pests, improve pollination, or enhance growing conditions.
Keep Away From
Avoid planting basil near these crops — they can inhibit each other's growth, attract shared pests, or compete aggressively.
Common Problems Growing Basil
Downy mildew (Peronospora belbahrii) is a serious basil disease in humid conditions — look for yellowing upper leaves with grey-purple fuzz beneath.
Remove affected plants immediately; do not compost.
Choose resistant varieties like 'Eleonora' or 'Lemondeo'.
Aphids cluster on new shoots — blast off with water or treat with neem oil.
Root rot occurs in waterlogged soils — ensure free drainage in your raised bed mix.
Fusarium wilt causes sudden plant collapse; remove and destroy affected plants.
Harvesting Basil
Harvest basil by pinching off the top pair of leaves and the stem tip, just above a set of leaves. This encourages two new shoots to form, doubling the harvest points. Harvest in the morning when essential oil concentration is highest. For large harvests, cut stems to a third of the plant's height.
Expected Yield
Ongoing — a single plant can produce 300–500g over a season with regular harvesting
Yield depends on variety, growing conditions, and management. These are typical results for well-maintained Australian raised beds.
Automatic Companion Planting
Plant Planner checks every crop assignment against the full companion database — it knows that Basil grows well with Tomato and Capsicum and warns you about antagonists automatically.
Unlock FreeHow Much Basil to Grow
2–4 plants is sufficient for fresh use; plant 6+ if making pesto regularly
These estimates are based on average Australian household consumption. Adjust up if you plan to preserve, freeze, or use heavily; adjust down for occasional use.
Growing Basil — Frequently Asked Questions
How long does basil take to grow in Australia?
Basil germinates in 5–10 days and is ready to harvest in 25–35 days to first harvest; ongoing. Harvest basil by pinching off the top pair of leaves and the stem tip, just above a set of leaves.
How far apart should I plant basil?
Space basil plants 20 cm apart, with 30 cm between rows. Correct spacing gives each plant room for airflow and root development and is one of the easiest ways to lift your yield in a raised bed.
How much sun does basil need?
Full sun (6+ hours daily). Moderate — water at the base; basil hates wet foliage.
When should I plant basil in Australia?
It depends on your climate zone. In temperate areas (Sydney, Melbourne, Perth, Adelaide) plant basil September–February. Other zones: tropical — Year-round (reduce watering in wet season); subtropical — August–March; cool — October–January; arid — August–February.
What grows well with basil?
Basil grows well alongside Tomato, Capsicum, Lettuce, Asparagus, Marigold. Keep it away from Sage, Fennel, which can compete with it or attract shared pests.
How many basil plants does a family of four need?
2–4 plants is sufficient for fresh use; plant 6+ if making pesto regularly
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